<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>波纹效果</title>
  <style>
    .map {
      position: relative;
      width: 600px;
      height: 600px;
      background-color: blanchedalmond;
      margin: 0 auto;
    }
    .city {
      position: absolute;
      top: 40px;
      right: 50px;
      color: #fff 
    }
    .tb {
      top: 500px;
      right: 30px;
    }
    .dotted {
      width: 8px;
      height: 8px;
      background-color:cornflowerblue;
      border-radius: 50%;
    }
    .city div[class^="pulse"] {
      position: absolute;
      top: 50%;
      left: 50%;
      transform: translate(-50%, -50%);
      width: 8px;
      height: 8px;
      box-shadow: 0 0 12px cornflowerblue;
      border-radius: 50%;
      animation: pulse 2s linear infinite;
    }
    .city div.pulse2 {
      animation-delay: 0.8s;
    }
    .city div.pulse3 {
      animation-delay: 1s;
    }
    @keyframes pulse {
      0% {

      }
      70% {
        width: 40px;
        height: 40px;
        opacity: 1;
      }
      100% {
        width: 80px;
        height: 80px;
        opacity: 0;
      }
    }
  </style>
</head>
<body>
  <div class="map">
    <div class="city">
      <div class="dotted"></div>
      <div class="pulse1"></div>
      <div class="pulse2"></div>
      <div class="pulse3"></div>
    </div>
    <div class="city tb">
      <div class="dotted"></div>
      <div class="pulse1"></div>
      <div class="pulse2"></div>
      <div class="pulse3"></div>
    </div>
  </div>
</body>
</html>